Epoxy graphene oxide from a simple photo-Fenton reaction and its hybrid with phytic acid for enhancing U(VI) capture.
Epoxy graphene oxide from a simple photo-Fenton reaction and its hybrid with phytic acid for enhancing U(VI) capture.
复制标题
DOI：
10.1016/j.scitotenv.2020.140316
复制
发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Hao Lei;Daohui Zhou;Jiao Tang;Xiaoping Hu;Ning Pan;Hao Zou;F. Chi;Xiaoqiang Wang
中科院分区：
文献类型：
--
作者：
Hao Lei;Daohui Zhou;Jiao Tang;Xiaoping Hu;Ning Pan;Hao Zou;F. Chi;Xiaoqiang Wang
设计了一种新型的植酸（PA）功能化氧化石墨烯（P-pFGO-7）的制备方法，并将其作为吸附剂用于水溶液中U（VI）的高效捕集。对P-pFGO-7的结构和形貌进行了表征。结果表明，P-pFGO-7吸附容量高（266.7 mg/g，pH = 4.0，T = 298 K），吸附动力学快（~10 min），在多种共存离子中对U（VI）和Ln-An离子具有良好的选择性，并具有良好的再生能力。借助各种表征技术和批量吸附结果，发现PA对U（VI）的配位贡献最大，这主要取决于P双键O部分。P-pFGO-7在0.1mol/LNa 2CO 3溶液中可再生，解吸率在95%左右，经5次循环后可重复使用。本工作为氧化石墨烯的改性和PA在放射性废水中去除U（VI）的应用提供了一条可行的途径。
A novel approach to synthesize phytic acid (PA) functionalized graphene oxide (P-pFGO-7) treated by the photo-Fenton reaction has been designed, which has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of P-pFGO-7 were characterized well. The adsorption property for P-pFGO-7 was comprehensively assessed by batch experiments, showing the high adsorption capacity (266.7 mg/g, at pH = 4.0,T= 298 K), fast adsorption kinetics (~10 min), good selectivity for U(VI) and Ln-An ions in various coexisting ions and excellent regeneration capacity. With the assistance of various characterization techniques and batch adsorption results, it is found that PA makes the most contribution to coordinate U(VI) heavily depending on the Pdouble bondO moiety. P-pFGO-7 could be regenerated by 0.1 mol/L Na2CO3with ~95% desorption efficiency and reused well after five recycles. This present work provides a feasible route to modify graphene oxide and extend PA for potentially practical application in the removal of U(VI) from radioactive wastewater.